How do you wire the Hydra to control VVT? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-06-2011, 08:10 PM   #1
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Default How do you wire the Hydra to control VVT?

I found a built motor - 94 block with an 03 VVT head. I have read that you only need to solder two wires to control VVT with the Hydra, but that's all I've heard.

Does anyone know specifically what to do to allow the Hydra to control VVT?
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Old 04-06-2011, 08:42 PM   #2
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Basically you have to connect your hydra VTCS pin to one of the VVT solenoid wires. I have no clue what the solenoid wires are but I am guessing it's 3 wire:

power
ground
signal

Or signal/ground??


Jeremy has the Hydra pinout. If yours is the same as mine, the VVT signal output pin is A11 on the small blue connector. Your harness may already be set up and if it's not, then you'll need to order some pins from Jeremy.

Anyways connect them bitches then

Go to Output Configuration
click PWM 2
Make sure PWM MAP 9 radio button is selected
input x rpm spread %
input y load spread %

Then hit ok or whatever

Then go to Select/3D PWM/PWM Map 9

That should be your VVT map.

Also here is the 2.5 manual and it talks about it more:

http://flyinmiata.com/support/instru...ECU_Tuning.pdf

In short, your map is probably already set up, your harness is probably already set up so just wire that **** up. I don't have the factory wiring diagrams with me but they're on here mt.net somewhere.
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Old 04-06-2011, 09:48 PM   #3
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^Thanks, I really appreciate the info.
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Old 04-06-2011, 11:00 PM   #4
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power and PWM = 2 wires. the power wire goes straight to the harness +12.
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Old 04-07-2011, 12:34 AM   #5
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Quote:
Originally Posted by y8s View Post
power and PWM = 2 wires. the power wire goes straight to the harness +12.
Let me guess. It's the white wire with the red stripe?
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Old 04-07-2011, 10:03 AM   #6
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Ok, is it this simple or am I missing something (Hydra 2.5)?

1. Wire the power from VVT solenoid --------> Hydra harness A11 on small blue connector

2. In Hydra, go to --> Select --> 3D pwm --> PWM Map9 / VCTi
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Old 04-07-2011, 11:19 AM   #7
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err...

4D, Yellow, goes to +12V (you can splice into 4AF, yes white with red stripe)

4R, violet with yellow stripe, goes to whatever the VVT output pin is.
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Old 04-07-2011, 12:47 PM   #8
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I was not familiar with the Mazda pins, sorry. I think I understand now. Thanks.
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Old 04-07-2011, 05:52 PM   #9
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BTW be careful. Jeremy told me of a few instances where customers did not make their map smoothed and fucked up their ****. I don't really understand that but take heed.
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Old 04-07-2011, 07:10 PM   #10
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^ Thanks for the heads up. I don't plan on tuning it, but rather letting a "tuner" do it on a dyno. But, I am concerned about the settings during break in.

Right now my settings in my current map under PWM MAP9 are all set to -12.5.

EDIT; I will just make sure the OFF radio button is checked under PWM2 during break in. Then I'll let the tuner turn it on and set the X, Y spread and go with it.

Last edited by 05pearl; 04-07-2011 at 10:17 PM.
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Old 06-24-2011, 08:20 AM   #11
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Quote:
Originally Posted by y8s View Post
err...

4D, Yellow, goes to +12V (you can splice into 4AF, yes white with red stripe)

4R, violet with yellow stripe, goes to whatever the VVT output pin is.
Love the search function on this forum. This is just what I was looking for. This made me a happy camper
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Old 11-22-2011, 07:55 PM   #12
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I actually have the VVT retrofit stuff as a document, email me at work & I can send it to you. Same for TPS if you're coming from a 90-93 chassis, and 94 alternator retrofit if you're tired of your NB voltage control..
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